Stainless steel liquid waste regeneration system based on spray roasting method and control method thereof

Abstract

The invention discloses a stainless steel liquid waste regeneration system based on the spray roasting method.The system comprises an adsorption tower, a jet cleaning tower, a spray cooling tower, an oxidizing tower and a denitration device which are connected in sequence, wherein a spray liquid outlet of the jet cleaning tower is communicated with a first spray liquid inlet of the jet cleaning tower and a spray liquid inlet of the adsorption tower through pipelines, a spray liquid outlet of the spray cooling tower is communicated with a spray liquid inlet of the spray cooling tower and a second spray liquid inlet of the jet cleaning tower through pipelines, a spray liquid outlet of the oxidizing tower is communicated with a spray liquid inlet of the oxidizing tower and a chamber of the jet cleaning tower through pipelines, a jet cleaning pump is installed on a pipeline at the position of the spray liquid outlet of the jet cleaning tower, a spray cooling pump and a spray cooling circulating liquid cooler are installed on a pipeline at the position of the spray liquid outlet of the spray cooling tower, and an oxidizing tower pump and an oxidizing tower circulating liquid cooler are installed on a pipeline at the position of the spray liquid outlet of the oxidizing tower.By the adoption of the system, HNO3 recovery rate is increased.

Description

technical field [0001] The invention relates to the technical field of stainless steel rolling waste acid liquid regeneration, in particular to a stainless steel waste liquid regeneration system based on a spray roasting method and a control method thereof. Background technique [0002] The waste acid produced by stainless steel cold-rolled pickling strip and hot-rolled solid solution is extremely corrosive. If it is not treated, it will cause serious pollution to the environment. At the same time, due to the large amount of waste acid discharge, it will also increase the cost of pickling. In the current treatment of stainless steel pickling waste, the spray roasting process is the most advanced and completely regenerates the waste acid. [0003] In the waste acid regeneration process of the spray roasting method, the waste acid undergoes a chemical reaction to produce free HF and HNO 3 , after being absorbed by the absorption tower, the regenerated acid is formed, and at ...

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Problems solved by technology

[0004] In the actual engineering production operation, due to the NO x Under the conditions of high temperature and slight negative pressure, the oxidation rate is low, and the reaction rate is very slow, resulting in HNO 3 The overall recovery rate is low, generally only about 40%, very low NO x The recovery rate means that there is a large amount of HNO 3 At the same time, it will increase the investment in the catalyst of the denitrification system, and the amount of reducing agent ammonia or urea in the production and operation process will increase

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